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i*J     MORPHOLOGY AND EVOLUTION
moves on ail fours in a laborious and shaky manner. His long arms raise the upper part of his trunk, and Huxley likens his gait to that of a very old man bent down by age, and making his way along by the help of a
stick.
He walks on the outer borders of his feet and the inner edges of his hands. The upper surfaces of the toes and fingers rest on the ground, particularly by their proximal phalanges; and it will be seen later that this arrangement differs from that adopted by the quadrupedal Chimpanzee. The gait of the young animal can best be described as an awkward shuffle.
The long arms are useful for collecting the figs, leaves and young blossoms on which it subsists, but they are not used for hand-drinking, as are those of the Gibbons. The lips are used for drinking, and the lower one* is made into a capacious trough for collecting rain water. If it is supplied with a pail of milk it will pour it into the trough so formed.
Dr. Salomon Miiller, who carefully questioned many Dyak hunters, said: " According to the Dyaks, the only animal the Orang measures his strength with is the crocodile, who occasionally seizes him on his visits to the waterside. But they say that the Orang is more than a match for his enemy, and beats him to death, or rips up his throat by pulling the jaws asunder.'7
When the females are pregnant they may separate themselves from the others, and they may remain away till the young are born. The latter grow slowly and remain under care of their mothers for a considerable period. When the mothers are on the move the young ones cling to the hairs on their chests; and Wallace